Ordinary Hazard (Group 2) is defined as:

Ordinary Hazard (Group 2) is defined as:

• A. Low combustibility with small heat release.
• B. Moderate to high combustibility with specific height limits.
• C. Not defined by typical hazard categories.
• D. Moderate combustibility with no height limits.

Answer: (B)

Hazard classification in NFPA 13R guides how densely sprinklers are spaced and what heads are used. Ordinary Hazard is split into two groups, and Group 2 is defined by moderate to high combustibility with specific height limits. That combination—significant fuel load plus ceiling or room height constraints—drives the design criteria for coverage. So the best description is that Ordinary Hazard (Group 2) involves moderate to high combustibility with specific height limits because it captures spaces where the fire potential is greater than a light hazard but still within the practical limits that 13R can accommodate, leading to tighter design requirements than Group 1. The other options don’t fit because they describe conditions not aligned with Group 2: low combustibility with small heat release corresponds to a light hazard; saying there are no height limits contradicts the defined height criteria that come with Group 2; and claiming there’s no defined hazard category is incorrect since 13R does define hazard groups, including Group 2.

Hazard classification in NFPA 13R guides how densely sprinklers are spaced and what heads are used. Ordinary Hazard is split into two groups, and Group 2 is defined by moderate to high combustibility with specific height limits. That combination—significant fuel load plus ceiling or room height constraints—drives the design criteria for coverage.

So the best description is that Ordinary Hazard (Group 2) involves moderate to high combustibility with specific height limits because it captures spaces where the fire potential is greater than a light hazard but still within the practical limits that 13R can accommodate, leading to tighter design requirements than Group 1.

The other options don’t fit because they describe conditions not aligned with Group 2: low combustibility with small heat release corresponds to a light hazard; saying there are no height limits contradicts the defined height criteria that come with Group 2; and claiming there’s no defined hazard category is incorrect since 13R does define hazard groups, including Group 2.